EP1405000A1 - Pipe press coupling comprising a press sleeve, and a pressing method - Google Patents

Pipe press coupling comprising a press sleeve, and a pressing method

Info

Publication number
EP1405000A1
EP1405000A1 EP02754289A EP02754289A EP1405000A1 EP 1405000 A1 EP1405000 A1 EP 1405000A1 EP 02754289 A EP02754289 A EP 02754289A EP 02754289 A EP02754289 A EP 02754289A EP 1405000 A1 EP1405000 A1 EP 1405000A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
press
pipe
area
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02754289A
Other languages
German (de)
French (fr)
Other versions
EP1405000B1 (en
Inventor
Manfred Reckzeh
Thomas Reckzeh
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Individual
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Individual
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Filing date
Publication date
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Publication of EP1405000A1 publication Critical patent/EP1405000A1/en
Application granted granted Critical
Publication of EP1405000B1 publication Critical patent/EP1405000B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/146—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by an axially moveable sleeve

Definitions

  • the invention relates to a pipe press coupling according to the preamble of claim 1, a compression sleeve according to claim 8 and a compression method according to the preamble of claim 9.
  • Generic pipe press couplings are known for example from EP 01 59 997. These are used to produce reliable and long-term stable connections for pipes made of plastics as well as relatively soft metals and multi-layer composite materials.
  • the known pipe press couplings can be used as an alternative to welding, for example for the connection of hydraulic lines, water or gas underground lines.
  • the principle of the pressing is that the pipe end to be pressed is pushed onto a support sleeve, which is generally profiled and is part of a fitting.
  • the diameter of the support sleeve or the profiles is selected such that - if the possible tolerances in the pipe diameter are observed - the pipe can be plugged onto the support sleeve without great effort.
  • a crimp sleeve is pushed over the pipe end.
  • a compression sleeve hereinafter referred to as "compression sleeve" for the sake of brevity
  • This compression sleeve has such an internal profile that the crimp sleeve and the tube below are deformed in such a way that the tube material is pressed into the profiles of the support sleeve in order to ensure a long-term stability -to get tight compression.
  • high axial forces are required, particularly in the case of larger tubes or metal tubes, which are generally applied by means of a special hydraulic pressing tool.
  • the compression sleeve is characterized by an essentially cylindrical inner profile.
  • the invention is based on the object of the axial compression to be applied in the known pipe press couplings. to reduce manpower. In this way, pipes with a larger diameter or made of harder, ie more difficult to form, materials should be accessible for pressing. Furthermore, a reduction in the pressing forces to be applied means that the pressing tools can be made more compact and cheaper and are easier to handle.
  • a crimp sleeve without profiling can be used within the scope of the teaching according to the invention, but a profiled crimp sleeve is preferably provided, which is assumed in the following description.
  • the pipe press coupling or press sleeve according to the invention is characterized in accordance with claim 1 in that the press sleeve has at least one radially circumferential press bead or an area with a tapered cross section.
  • This at least one press bead or at least one area with a tapered cross-section ensures that when the press sleeve is pushed on, the actual shaping work of the press sleeve or the pipe end only through the edge of the press bead or the press beads or the area or areas with a tapered cross section he follows.
  • the remaining inner areas of the press sleeve spring back a little in relation to the press bead or the tapered areas.
  • the at least one press bead has a substantially round cross-sectional shape, ie the press bead molded onto the inside of the press sleeve has the shape of a circular section in cross section.
  • the compression sleeve has an essentially hollow cylindrical shape or a slightly conical backward widening shape, with a first rounded compression bead with a first minimum diameter and axially inward directly on the end face that is pushed over the support sleeve area
  • a second rounded press bead with a second minimum diameter, which is smaller than the first minimum diameter, is provided behind this in the sliding-on direction. Due to the two different press beads with different minimum diameters, the pressing can take place in two phases, whereby the axial forces required for the deformation are reduced compared to a single-phase pressing.
  • the rounded shape of the press beads results in a small non-positive contact surface of the press sleeve on the crimp sleeve, which in turn reduces the friction.
  • the rounded shape further improves the sliding properties and prevents damage to the crimp sleeve.
  • the beads or cross-sectional tapering can also be used within the scope of the invention e.g. be essentially triangular or rectangular or in the form of a plurality of ribs or in any other shape, provided that it is ensured that the pressing forces for reducing the friction are essentially applied in the "front" region of the pressing sleeve in the pressing direction.
  • the press sleeve has an area with a — preferably essentially conical — cross-sectional taper in its end region opposite the press bead.
  • This conical area has the effect that the annular gap between the pipe end and the support sleeve is additionally compressed on the last part of the compression path. This prevents a medium transported in the pipe from penetrating into the area between the support sleeve and the pipe via the annular gap and possibly causing corrosion effects there.
  • the crimp sleeve can preferably have a profile on the outside which corresponds to the profile of the support sleeve, ie the crimp sleeve has a larger diameter in the regions in which the support sleeve profile has a recess in each case.
  • the pipe material is particularly forced into the recesses in the support sleeve.
  • the profiling is preferably also rounded in order to improve the sliding properties.
  • the surface of the compression sleeve is preferably made harder than the material of the compression sleeve.
  • FIG. 1 shows a schematic cross-sectional illustration of a pipe press coupling according to the invention in the non-pressed state
  • FIG. 2 shows an alternative embodiment of the pipe press coupling according to FIG. 1;
  • Fig. 4 shows the press sleeve according to the invention according to Figure 1 in the pressed state.
  • FIG. 1 shows the cross section of a pipe press coupling according to the invention (not to scale), the coupling as a whole being of rotationally symmetrical design (lower mirror-image part not shown).
  • the materials used for the individual elements can be plastics (in particular modified plastics) or metals (e.g. steel, copper, brass, cast materials).
  • the pipe press coupling has a pipe end 10 which is pushed onto a profiled support sleeve 12.
  • the support sleeve 12 is part of a - not fully shown - fitting 14 (for example a coupling, a T-piece, etc.).
  • the pipe end 10 abuts against a stop 16 formed integrally with the fitting.
  • a crimp sleeve 18 has been pushed over the pipe end against the stop 16, which has an essentially cylindrical inside diameter and an outside diameter has two round profiles 20a, 20b.
  • a compression sleeve 22 is axially pushed onto the compression sleeve 18 via the compression sleeve 18, generally by means of a special hydraulic tool.
  • the axial inner profile of the compression sleeve 22 is designed in such a way that the crimp sleeve 18 and thus the tube end 10 underneath it are reshaped, as a result of which the material of the tube end 10 engages in the profiling of the support sleeve (cf. the compression state according to FIG. 4) and pronounced one firm axial fixation and long-term stable sealing is achieved.
  • the press sleeve (cf. enlarged representation in FIG. 3) has two radially rotating press beads 24 and 26.
  • the first press bead 24 is provided directly on the end face of the press sleeve facing the fitting.
  • a second pressing bead 26 In the pressing direction behind (ie in the drawing on the left) of the first pressing bead 24 there is a second pressing bead 26, by means of which the pressing sleeve is narrowed more than by the first pressing bead 24.
  • the first pressing bead can spring back somewhat in the axial area before the second pressing bead , as can be seen from Fig. 1, or also transition into an approximately cylindrical surface in the transition area. It is important that the compression sleeve springs back a little behind the second compression bead 26, so that the compression and thus the frictional forces in this area 32 are reduced by a corresponding “relaxation”.
  • the crimp sleeve 18 and the tube end 10 located below it are compressed.
  • the higher protruding profiles 20a, 20b are compressed in succession by both beads 24, 26 in two phases, while the remaining areas are essentially compressed by phase 26.
  • the rounded shape of the profiles and the beads ensures good sliding properties.
  • the actual contact area 30 is thereby relatively small, which also reduces the friction.
  • the tube is shaped in this way in such a way that it is held in the profiling of the support sleeve 12. Since the deformation is partly inelastic, the restoring forces which act on the central area 32 of the press sleeve are considerably lower than in the areas of the press beads. As a result, the frictional forces to be overcome remain relatively constant over the pressing path, which is in contrast to the prior art, in which the forces increase significantly over the pressing path due to the increasingly larger, opposing surfaces.
  • the beads 24, 26 additionally fulfill a securing function for the pressing sleeve, since in the end position (FIG. 4) they work into a kind of cavity, which prevents the pressing sleeve from moving backwards and the pressing sleeve is thus self-locking.
  • a conically tapering region 28 is additionally provided on the inside in the end region facing the pipe end (on the left in the illustration) (in FIG. 1, the dimension of the taper is illustrated with an increase in contrast to FIG. 3).
  • the pipe end 10 is pressed in a particularly strongly positive manner in the transition area to the support sleeve 12, so that penetration of the medium transported in the pipe 10 reliably into the annular gap between the pipe end and the support sleeve and the associated crevice corrosion is prevented.
  • the crimp sleeve is again cylindrical over a short section.
  • FIG. 2 shows an alternative embodiment of the pipe press coupling according to the invention, in which the same parts are provided with the same reference numerals.
  • the difference from FIG. 1 essentially consists in a different profile of the support sleeve 12 and the crimp sleeve, which has three profiles 20a, 20b and 20c.
  • the crimp sleeve 18 protrudes somewhat above the compression sleeve 22 in the pressed state. This provides additional support for the pipe end 10.
  • the pressing according to the invention is also suitable for metal pipes e.g. made of steel, stainless steel or copper.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Cable Accessories (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Extrusion Of Metal (AREA)

Abstract

The invention relates to a pipe press coupling which, when in a pressed state, connects at least one end area (10) of a pipe to a supporting sleeve (12), which is placed inside the pipe end, by means of a press sleeve (22) that is axially slid onto the exterior of the pipe and exerts radial pressing forces. In order to effect the pressing, the pipe end (10) provided with a crimping sleeve (18) is slid onto the supporting sleeve (12), and the press sleeve (22) is axially slid over the pipe end in the area of the supporting sleeve. According to the invention, the press sleeve (22) comprises, on the inside, at least one radially encircling press bead or at least one area with a tapered cross-section (24; 26) in the area that is firstly slid over the area of the supporting sleeve when the press sleeve is slid over. Said bead or cross-section is designed as to enable pressing forces to be applied that are greater than those applied by at least one axial inner section (32) of the press sleeve (22) axially situated in the sliding-on direction behind the press bead or behind the area having the tapered cross-section. This results in reducing the frictional forces occurring during pressing and thus the pressing forces to be applied.

Description

Akte : 02 194 File: 02 194
Rohrpresskupplung mit Presshülse sowie VerpressungsverfahrenPipe press coupling with press sleeve and pressing process
Die Erfindung betrifft eine Rohrpresskupplung gemäß dem Oberbegriff des Patentanspruchs 1, eine Presshülse gemäß Anspruch 8 sowie ein Verpressungsverfahren gemäß dem Oberbegriff des Anspruchs 9.The invention relates to a pipe press coupling according to the preamble of claim 1, a compression sleeve according to claim 8 and a compression method according to the preamble of claim 9.
Gattungsgemäße Rohrpresskupplungen sind beispielsweise aus der EP 01 59 997 bekannt. Diese dienen dazu, zuverlässige und langzeitstabile Verbindungen bei Rohren aus Kunststoffen sowie relativ weichen Metallen sowie Mehrschicht-Verbund- Werkstoffen herzustellen. Die bekannten Rohrpresskupplungen können als Alternative zum Schweißen beispielsweise für die Verbindung von Hydraulikleitungen, Wasser- oder Gaserdleitungen eingesetzt werden.Generic pipe press couplings are known for example from EP 01 59 997. These are used to produce reliable and long-term stable connections for pipes made of plastics as well as relatively soft metals and multi-layer composite materials. The known pipe press couplings can be used as an alternative to welding, for example for the connection of hydraulic lines, water or gas underground lines.
Das Prinzip der Verpressung besteht darin, dass das zu verpressende Rohrende auf eine in der Regel profiliert ausgebildete Stützhülse aufgeschoben wird, die Teil eines Fit- tings ist. Der Durchmesser der Stützhülse bzw. der Profilierungen ist derart gewählt, dass — bei Beachtung der mögli- chen Toleranzen im Rohrdurchmesser — das Rohr ohne großen Kraftaufwand auf die Stützhülse gesteckt werden kann. Über das Rohrende wird bei der bekannten Verpressung eine Quetschhülse aufgeschoben. Über diese Quetschhülse wird schließlich axial eine Überwurf-Presshülse (nachfolgend der Kürze halber als "Presshülse" bezeichnet) aufgeschoben. Diese Presshülse weist ein derartiges Innenprofil auf, dass die Quetschhülse und das darunterliegende Rohr derart verformt werden, dass das Rohrmaterial in die Profilierungen der Stützhülse gedrückt wird, um so eine langzeitstabile und -dichte Verpressung zu erhalten. Zum Aufschieben der Presshülse sind insbesondere bei größeren Rohren oder bei Metallrohren hohe axiale Kräfte erforderlich, die in der Regel mittels eines speziellen hydraulischen Presswerkzeugs aufge- bracht werden. Die Presshülse zeichnet sich bei den bekannten Rohrpresskupplungen durch ein im Wesentlichen zylindrisches Innenprofil aus.The principle of the pressing is that the pipe end to be pressed is pushed onto a support sleeve, which is generally profiled and is part of a fitting. The diameter of the support sleeve or the profiles is selected such that - if the possible tolerances in the pipe diameter are observed - the pipe can be plugged onto the support sleeve without great effort. In the known pressing, a crimp sleeve is pushed over the pipe end. Finally, a compression sleeve (hereinafter referred to as "compression sleeve" for the sake of brevity) is pushed axially over this crimp sleeve. This compression sleeve has such an internal profile that the crimp sleeve and the tube below are deformed in such a way that the tube material is pressed into the profiles of the support sleeve in order to ensure a long-term stability -to get tight compression. In order to push on the compression sleeve, high axial forces are required, particularly in the case of larger tubes or metal tubes, which are generally applied by means of a special hydraulic pressing tool. In the known pipe press couplings, the compression sleeve is characterized by an essentially cylindrical inner profile.
Bei den bekannten Rohrpresskupplungen ist nachteilig, dass die für die Verpressung aufzubringenden Kräfte relativ hoch sind, so dass auch bei Verwendung hydraulischer Verpresswerkzeuge der Einsatzbereich der bekannten Verpressungen - abhängig vom Rohrdurchmesser, der Rohrwandstärke und der Härte des Rohrmaterials - begrenzt ist. Die hohen Verpres- sungskräfte hängen damit zusammen, dass das Rohrmaterial in das Profil der Stützhülse verdrängt wird. Insbesondere bei dickwandigen Rohren sind hierzu hohe Kräfte erforderlich. Um Toleranzen hinsichtlich der Rohrdicke (insbesondere hinsichtlich des Rohrinnendurchmessers) auszugleichen und ei- nerseits trotz der Toleranzen zu gewährleisten, dass das Rohrende mit vertretbarem Kraftaufwand auf die Stützhülse aufgeschoben werden kann sowie andererseits ein ausreichendes Eindrücken des Rohrmaterials in die Profilierung der Stützhülse und somit eine zuverlässige Abdichtung zu gewähr- leisten, müssen die Umformungen des Rohrmaterials ein bestimmtes Ausmaß ausweisen. Aus diesen Gründen ist das bekannte Verpressungssystem trotz seiner Zuverlässigkeit bei größeren Rohrleitungen bislang nicht einsetzbar, da die erforderlichen Presskräfte an die Grenzen der Materialbelast- barkeit reichen und die erforderlichen Verpresswerkzeuge zu aufwendig werden.In the known pipe press couplings, it is disadvantageous that the forces to be applied for the pressing are relatively high, so that even when using hydraulic pressing tools, the area of use of the known pressing is limited - depending on the pipe diameter, the pipe wall thickness and the hardness of the pipe material. The high compression forces are related to the fact that the pipe material is displaced into the profile of the support sleeve. High forces are required for this, especially with thick-walled pipes. In order to compensate for tolerances with regard to the pipe thickness (in particular with regard to the inside diameter of the pipe) and on the one hand to ensure, despite the tolerances, that the pipe end can be pushed onto the support sleeve with reasonable effort and on the other hand that the pipe material is sufficiently pressed into the profile of the support sleeve and thus reliable To ensure sealing, the deformations of the pipe material must show a certain extent. For these reasons, the known crimping system, despite its reliability, has so far not been usable with larger pipelines, since the required pressing forces reach the limits of the material load capacity and the required crimping tools become too complex.
Der Erfindung liegt die Aufgabe zugrunde, die bei den bekannten Rohrpresskupplungen aufzubringenden axialen Verpres- sungskräfte zu reduzieren. Damit sollen auch Rohre mit größerem Durchmesser bzw. aus härteren, d.h. schwerer umformbaren Materialien einer Verpressung zugänglich werden. Weiterhin führt eine Reduktion der aufzubringenden Verpresskräfte dazu, dass die Verpresswerkzeuge kompakter und preiswerter ausgebildet sein können sowie leichter handhabbar sind.The invention is based on the object of the axial compression to be applied in the known pipe press couplings. to reduce manpower. In this way, pipes with a larger diameter or made of harder, ie more difficult to form, materials should be accessible for pressing. Furthermore, a reduction in the pressing forces to be applied means that the pressing tools can be made more compact and cheaper and are easier to handle.
Die Lösung der vorstehend genannten Aufgabe erfolgt mit einer Rohrpresskupplung gemäß Patentanspruch 1 bzw. einer Presshülse gemäß Patentanspruch 8 bzw. mit einem Verpress- verfahren gemäß Patentanspruch 9.The above-mentioned object is achieved with a pipe press coupling according to claim 1 or a press sleeve according to claim 8 or with a pressing method according to claim 9.
Zweckmäßige Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Appropriate embodiments of the invention result from the subclaims.
Im Rahmen der erfindungsgemäßen Lehre kann grundsätzlich eine Quetschhülse ohne Profilierung eingesetzt werden, jedoch ist bevorzugt eine profilierte Quetschhülse vorgesehen, wovon in der nachfolgenden Beschreibung jeweils ausgegangen wird .In principle, a crimp sleeve without profiling can be used within the scope of the teaching according to the invention, but a profiled crimp sleeve is preferably provided, which is assumed in the following description.
Die erfindungsgemäße Rohrpresskupplung bzw. Presshülse zeichnet sich gemäß Patentanspruch 1 dadurch aus, dass die Presshülse wenigstens einen radial umlaufenden Presswulst bzw. einen Bereich mit verjüngtem Querschnitt aufweist. Durch diesen wenigstens einen Presswulst bzw. wenigstens einen Bereich mit verjüngtem Querschnitt wird erreicht, dass beim Aufschieben der Presshülse die eigentliche Umformarbeit der Quetschhülse bzw. des Rohrendes nur durch die Kante des Presswulstes bzw. der Presswülste bzw. den Bereich oder die Bereiche mit verjüngtem Querschnitt erfolgt. Die übrigen Innenbereiche der Presshülse springen gegenüber dem Presswulst bzw. der verjüngten Bereiche etwas zurück. Dadurch werden die Reibungskräfte beim axialen Übereinandergleiten von Quetschhülse und Presshülse, die — wie im Rahmen der vorliegenden Erfindung erkannt wurde — einen großen Teil der für die Verpressung erforderlichen Kräfte ausmachen — deutlich reduziert. Die Qualität der Verpressung wird hierdurch ver- bessert, da das Material des Quetschringes bzw. des Rohrendes im Wesentlichen inelastisch verformt wird und daher seine Form beibehält, nachdem der Wulst bzw. die Verjüngung den entsprechenden axialen Verpressungsbereich passiert hat. Bei den bekannten Rohrpresskupplungen, die eine Presshülse mit einem im Wesentlichen zylindrischen Innenprofil aufweisen, drücken die gesamten Umfangsflächen der Quetschhülse mit zum Teil erheblichen Rückstellkräften auf die gesamten im Bereich der Stützhülse befindlichen Innenflächen der Quetschhülse, was sowohl bei großen als auch bei kleinen Rohrdurchmessern zu erheblichen Reibungskräften führt. Die Reibungskräfte bei den bekannten Rohrpresskupplungen steigen größenordnungsmäßig mit dem Rohrdurchmesser bzw. der Rohrwanddicke überproportional stark an, was im Rahmen der Erfindung weitgehend vermieden wird. Mit der erfindungsgemäßen Presshülse können die erforderlichen maximalen Presskräfte um größenordnungsmäßig beispielsweise 30 bis 50 % reduziert werden, ohne dass dabei die Qualität der Verpressung verschlechtert wird.The pipe press coupling or press sleeve according to the invention is characterized in accordance with claim 1 in that the press sleeve has at least one radially circumferential press bead or an area with a tapered cross section. This at least one press bead or at least one area with a tapered cross-section ensures that when the press sleeve is pushed on, the actual shaping work of the press sleeve or the pipe end only through the edge of the press bead or the press beads or the area or areas with a tapered cross section he follows. The remaining inner areas of the press sleeve spring back a little in relation to the press bead or the tapered areas. As a result, the frictional forces in the axial sliding of Crimp sleeve and compression sleeve, which - as was recognized in the context of the present invention - make up a large part of the forces required for pressing - significantly reduced. The quality of the pressing is improved in this way, since the material of the crimp ring or the pipe end is deformed essentially inelastically and therefore retains its shape after the bead or the taper has passed the corresponding axial pressing area. In the known pipe press couplings, which have a press sleeve with a substantially cylindrical inner profile, the entire circumferential surfaces of the ferrule press with partially considerable restoring forces on the entire inner surfaces of the ferrule located in the area of the support sleeve, which is significant both with large and with small pipe diameters Frictional forces. The frictional forces in the known pipe press couplings increase disproportionately with the pipe diameter or the pipe wall thickness, which is largely avoided within the scope of the invention. With the press sleeve according to the invention, the required maximum press forces can be reduced by an order of magnitude, for example 30 to 50%, without the quality of the pressing being impaired in the process.
In einer bevorzugten Ausfuhrungsform der Erfindung weist der wenigstens eine Presswulst eine im Wesentlichen runde Quer- schittsgestalt auf, d.h., der an die Innenseite der Presshülse angeformte Presswulst weist im Querschnitt die Gestalt eines Kreisabschnittes auf. Besonders bevorzugt weist die Presshülse eine im Wesentlichen hohlzylinderförmige oder eine leicht konisch nach hinten sich erweiternde Grundform auf, wobei unmittelbar an der Stirnseite, die über den Stützhülsenbereich geschoben wird, ein erster abgerundeter Presswulst mit einem ersten Minimaldurchmesser und axial in Aufschiebrichtung dahinter liegend ein zweiter abgerundeter Presswulst mit einem zweiten Minimaldurchmesser vorgesehen ist, der kleiner als der erste Minimaldurchmesser ist. Durch die zwei verschiedenen Presswülste mit unterschiedlichen Mi- nimaldurchmessern kann die Verpressung in zwei Phasen erfolgen, wodurch die für die Verformung erforderlichen axialen Kräfte gegenüber einer einphasigen Verpressung reduziert werden.In a preferred embodiment of the invention, the at least one press bead has a substantially round cross-sectional shape, ie the press bead molded onto the inside of the press sleeve has the shape of a circular section in cross section. Particularly preferably, the compression sleeve has an essentially hollow cylindrical shape or a slightly conical backward widening shape, with a first rounded compression bead with a first minimum diameter and axially inward directly on the end face that is pushed over the support sleeve area A second rounded press bead with a second minimum diameter, which is smaller than the first minimum diameter, is provided behind this in the sliding-on direction. Due to the two different press beads with different minimum diameters, the pressing can take place in two phases, whereby the axial forces required for the deformation are reduced compared to a single-phase pressing.
Durch die abgerundete Form der Presswülste ergibt sich eine geringe kraftschlüssige Auflagefläche der Presshülse auf der Quetschhülse, wodurch wiederum die Reibung reduziert wird. Durch die abgerundete Form werden weiterhin die Gleiteigenschaften verbessert und es wird eine Beschädigung der Quetschhülse vermieden.The rounded shape of the press beads results in a small non-positive contact surface of the press sleeve on the crimp sleeve, which in turn reduces the friction. The rounded shape further improves the sliding properties and prevents damage to the crimp sleeve.
Alternativ können die Wülste bzw. Querschnittsverjüngungen jedoch im Rahmen der Erfindung auch z.B. im Wesentlichen dreiecksförmig oder rechteckig oder in Form mehrerer Rippen oder in jeder beliebigen anderen Form ausgebildet sein, sofern gewährleistet ist, dass die Presskräfte zur Reduzierung der Reibung im Wesentlichen in dem in Verpressrichtung "vorderen" Bereich der Presshülse aufgebracht werden.Alternatively, the beads or cross-sectional tapering can also be used within the scope of the invention e.g. be essentially triangular or rectangular or in the form of a plurality of ribs or in any other shape, provided that it is ensured that the pressing forces for reducing the friction are essentially applied in the "front" region of the pressing sleeve in the pressing direction.
Besonders bevorzugt weist die Presshülse in ihrem dem Presswulst gegenüberliegenden Stirnendbereich einen Bereich mit einer — bevorzugt im Wesentlichen konischen - Querschnittsverjüngung auf. Dieser konische Bereich bewirkt, dass der Ringspalt zwischen Rohrende und Stützhülse auf dem letzten Stück des Verpressungsweges zusätzlich komprimiert wird. Damit wird verhindert, dass ein in dem Rohr transportiertes Medium über den Ringspalt in den Bereich zwischen Stützhülse und Rohr eindringt und dort evtl. Korrosionseffekte bewirkt. Die Quetschhülse kann bevorzugt außenseitig eine Profilierung aufweisen, die mit der Profilierung der Stützhülse korrespondiert, d.h., dass die Quetschhülse einen größeren Durchmesser in den Bereichen besitzt, in denen das Stützhül- senprofil jeweils eine Ausnehmung aufweist. Dadurch wird das Rohrmaterial besonders in die Ausnehmungen der Stützhülse gezwungen. Die Profilierung ist bevorzugt ebenfalls abgerundet ausgebildet, um die Gleiteigenschaften zu verbessern.In a particularly preferred manner, the press sleeve has an area with a — preferably essentially conical — cross-sectional taper in its end region opposite the press bead. This conical area has the effect that the annular gap between the pipe end and the support sleeve is additionally compressed on the last part of the compression path. This prevents a medium transported in the pipe from penetrating into the area between the support sleeve and the pipe via the annular gap and possibly causing corrosion effects there. The crimp sleeve can preferably have a profile on the outside which corresponds to the profile of the support sleeve, ie the crimp sleeve has a larger diameter in the regions in which the support sleeve profile has a recess in each case. As a result, the pipe material is particularly forced into the recesses in the support sleeve. The profiling is preferably also rounded in order to improve the sliding properties.
Bevorzugt ist die Oberfläche, der Presshülse härter ausgebildet als das Material der Quetschhülse.The surface of the compression sleeve is preferably made harder than the material of the compression sleeve.
Die Erfindung wird nachfolgend anhand der Zeichnungen beispielhaft näher erläutert. Es zeigen:The invention is explained in more detail below using the drawings as an example. Show it:
Fig. 1 eine schematische Querschnittsdarstellung einer erfindungsgemäßen Rohrpresskupplung im nicht ver- pressten Zustand;1 shows a schematic cross-sectional illustration of a pipe press coupling according to the invention in the non-pressed state;
Fig. 2 eine alternative Ausfuhrungsform der Rohrpresskupplung gemäß Figur 1 ;2 shows an alternative embodiment of the pipe press coupling according to FIG. 1;
Fig. 3 eine vergrößerte Darstellung des Querschnitts der erfindungsgemäßen Presshülse; und3 shows an enlarged illustration of the cross section of the press sleeve according to the invention; and
Fig. 4 die erfindungsgemäße Presshülse gemäß Figur 1 im verpressten Zustand.Fig. 4 shows the press sleeve according to the invention according to Figure 1 in the pressed state.
In Figur 1 ist der Querschnitt einer erfindungsgemäßen Rohr- presskupplung (nicht maßstäblich) dargestellt, wobei die Kupplung insgesamt rotationssymmetrisch ausgebildet ist (unterer spiegelbildlicher Teil nicht dargestellt). Die für die einzelnen Elemente verwendeten Materialien können Kunststoffe (insbesondere modifizierte Kunststoffe) oder Metalle (z.B. Stahl, Kupfer, Messing, Gußmaterialien) sein. Die Rohrpresskupplung weist ein Rohrende 10 auf, das auf eine profilierte Stützhülse 12 aufgeschoben ist. Die Stützhülse 12 ist Teil eines - nicht vollständig dargestellten - Fittings 14 (z.B. einer Kupplung, eines T-Stücks usw.). Das Rohrende 10 stößt gegen einen integral mit dem Fitting gebildeten Anschlag 16. Vor dem Aufstecken des Rohrendes 10 auf die Stützhülse 12 wurde eine Quetschhülse 18 über das Rohrende gegen den Anschlag 16 geschoben, die einen im We- sentlichen zylinderför igen Innendurchmesser und einen Außendurchmesser mit zwei runden Profilierungen 20a, 20b aufweist.FIG. 1 shows the cross section of a pipe press coupling according to the invention (not to scale), the coupling as a whole being of rotationally symmetrical design (lower mirror-image part not shown). The materials used for the individual elements can be plastics (in particular modified plastics) or metals (e.g. steel, copper, brass, cast materials). The pipe press coupling has a pipe end 10 which is pushed onto a profiled support sleeve 12. The support sleeve 12 is part of a - not fully shown - fitting 14 (for example a coupling, a T-piece, etc.). The pipe end 10 abuts against a stop 16 formed integrally with the fitting. Before the pipe end 10 is fitted onto the support sleeve 12, a crimp sleeve 18 has been pushed over the pipe end against the stop 16, which has an essentially cylindrical inside diameter and an outside diameter has two round profiles 20a, 20b.
Über die Quetschhülse 18 wird — in der Regel mittels eines speziellen hydraulischen Werkzeugs — eine Presshülse 22 axial auf die Quetschhülse 18 aufgeschoben. Das axiale Innenprofil der Presshülse 22 ist derart ausgebildet, dass die Quetschhülse 18 und damit das darunterliegende Rohrende 10 umgeformt werden, wodurch das Material des Rohrendes 10 in die Profilierung der Stützhülse eingreift (vgl. den Verpres- sungszustand gemäß Fig. 4) und eine ausgesprochen feste axiale Fixierung und langzeitstabile Abdichtung erreicht wird.A compression sleeve 22 is axially pushed onto the compression sleeve 18 via the compression sleeve 18, generally by means of a special hydraulic tool. The axial inner profile of the compression sleeve 22 is designed in such a way that the crimp sleeve 18 and thus the tube end 10 underneath it are reshaped, as a result of which the material of the tube end 10 engages in the profiling of the support sleeve (cf. the compression state according to FIG. 4) and pronounced one firm axial fixation and long-term stable sealing is achieved.
Im Rahmen der Erfindung weist die Presshülse (vgl. vergrößerte Darstellung in Fig. 3) zwei radial umlaufende Presswülste 24 und 26 auf. Der erste Presswulst 24 ist direkt an der dem Fitting zugewandten Stirnseite der Presshülse vorgesehen. In Verpressrichtung hinter (d.h. in der Zeichnung links) von dem ersten Presswulst 24 befindet sich ein zweiter Presswulst 26, durch den die Presshülse stärker verengt wird als durch den ersten Presswulst 24. Der erste Presswulst kann in dem axialen Bereich vor dem zweiten Presswulst etwas zurückspringen, wie aus Fig. 1 ersichtlich, oder auch im Übergangsbereich in eine näherungsweise zylindrische Fläche übergehen. Wichtig ist, dass die Presshülse hinter dem zweiten Presswulst 26 etwas zurückspringt, so dass die Press- und damit die Reibungskräfte in diesem Bereich 32 durch eine entsprechende „Entspannung" reduziert werden.In the context of the invention, the press sleeve (cf. enlarged representation in FIG. 3) has two radially rotating press beads 24 and 26. The first press bead 24 is provided directly on the end face of the press sleeve facing the fitting. In the pressing direction behind (ie in the drawing on the left) of the first pressing bead 24 there is a second pressing bead 26, by means of which the pressing sleeve is narrowed more than by the first pressing bead 24. The first pressing bead can spring back somewhat in the axial area before the second pressing bead , as can be seen from Fig. 1, or also transition into an approximately cylindrical surface in the transition area. It is important that the compression sleeve springs back a little behind the second compression bead 26, so that the compression and thus the frictional forces in this area 32 are reduced by a corresponding “relaxation”.
Beim Aufschieben der Presshülse 22 wird die Quetschhülse 18 und das darunter befindliche Rohrende 10 komprimiert. Die höher hervorstehenden Profilierungen 20a, 20b werden im Aus- führungsbeispiel nacheinander durch beide Wülste 24, 26 in zwei Phasen komprimiert, während die übrigen Bereiche im Wesentlichen von der Phase 26 komprimiert werden. Dabei bewirkt die abgerundete Form der Profilierungen sowie der Wülste gute Gleiteigenschaften. Weiterhin ist hierdurch die ei- gentliche Kontaktfläche 30 relativ klein, wodurch die Reibung ebenfalls reduziert wird. Insgesamt wird auf diese Weise das Rohr derart umgeformt, dass es in der Profilierung der Stützhülse 12 gehalten wird. Da die Umformung zu einem Teil inelastisch ist, sind die Rückstellkräfte, die auf den mittleren Bereich 32 der Presshülse wirken, erheblich geringer als in den Bereichen der Presswülste. Dadurch bleiben die zu überwindenden Reibungskräfte über den Verpressweg relativ konstant, was im Gegensatz zum Stand der Technik steht, bei dem die Kräfte durch die zunehmend größeren, ge- geneinander liegenden Flächen über den Verpressweg deutlich ansteigen.When pushing on the compression sleeve 22, the crimp sleeve 18 and the tube end 10 located below it are compressed. In the exemplary embodiment, the higher protruding profiles 20a, 20b are compressed in succession by both beads 24, 26 in two phases, while the remaining areas are essentially compressed by phase 26. The rounded shape of the profiles and the beads ensures good sliding properties. Furthermore, the actual contact area 30 is thereby relatively small, which also reduces the friction. Overall, the tube is shaped in this way in such a way that it is held in the profiling of the support sleeve 12. Since the deformation is partly inelastic, the restoring forces which act on the central area 32 of the press sleeve are considerably lower than in the areas of the press beads. As a result, the frictional forces to be overcome remain relatively constant over the pressing path, which is in contrast to the prior art, in which the forces increase significantly over the pressing path due to the increasingly larger, opposing surfaces.
Weiterhin erfüllen die Wülste 24, 26 zusätzlich eine Sicherungsfunktion für die Presshülse, da diese sich in der Endstellung (Fig. 4) in eine Art Kuhle einarbeiten, wodurch eine Rückwärtsbewegung der presshülse verhindert wird und die Presshulse somit selbstsichernd ist. In dem dem Rohrende zugewandten (in der Darstellung linken) Stirnendbereich ist innenseitig zusätzlich ein sich konisch verjüngender Bereich 28 vorgesehen (in Fig. 1 ist das Maß der Verjüngung zur Illustration im Gegensatz zu Fig. 3 ver- stärkt dargestellt). Damit wird erreicht, dass das Rohrende 10 in dem Übergangsbereich zur Stützhülse 12 besonders stark formschlüssig angepresst wird, so dass ein Eindringen des in dem Rohr 10 transportierten Mediums in den Ringspalt zwischen Rohrende und Stützhülse zuverlässig und die damit ein- hergehende Spaltkorrosion verhindert wird. Zum Stirnende hin ist die Quetschhülse über einen kurzen Abschnitt wiederum zylindrisch ausgebildet.Furthermore, the beads 24, 26 additionally fulfill a securing function for the pressing sleeve, since in the end position (FIG. 4) they work into a kind of cavity, which prevents the pressing sleeve from moving backwards and the pressing sleeve is thus self-locking. A conically tapering region 28 is additionally provided on the inside in the end region facing the pipe end (on the left in the illustration) (in FIG. 1, the dimension of the taper is illustrated with an increase in contrast to FIG. 3). This ensures that the pipe end 10 is pressed in a particularly strongly positive manner in the transition area to the support sleeve 12, so that penetration of the medium transported in the pipe 10 reliably into the annular gap between the pipe end and the support sleeve and the associated crevice corrosion is prevented. Towards the end, the crimp sleeve is again cylindrical over a short section.
In Fig. 2 ist eine alternative Ausfuhrungsform der erfin- dungsgemäßen Rohrpresskupplung dargestellt, bei der gleiche Teile mit gleichen Bezugszeichen versehen sind. Der Unterschied gegenüber Fig. 1 besteht im Wesentlichen in einer abweichenden Profilierung der Stützhülse 12 und der Quetschhülse, die drei Profilierungen 20a, 20b und 20c auf- weist.2 shows an alternative embodiment of the pipe press coupling according to the invention, in which the same parts are provided with the same reference numerals. The difference from FIG. 1 essentially consists in a different profile of the support sleeve 12 and the crimp sleeve, which has three profiles 20a, 20b and 20c.
Wie aus den Figuren ersichtlich, steht die Quetschhülse 18 im verpressten Zustand etwas über die Presshülse 22 vor. Dadurch wird eine zusätzliche Abstützung des Rohrendes 10 er- reicht.As can be seen from the figures, the crimp sleeve 18 protrudes somewhat above the compression sleeve 22 in the pressed state. This provides additional support for the pipe end 10.
Die erfindungsgemäße Verpressung eignet sich neben Kunststoffröhren auch für Metallrohre z.B. aus Stahl, Edelstahl oder Kupfer. In addition to plastic tubes, the pressing according to the invention is also suitable for metal pipes e.g. made of steel, stainless steel or copper.

Claims

Patentansprüche claims
1. Rohrpresskupplung, bei der im verpressten Zustand wenigstens ein Endbereich (10) eines Rohres mittels einer außen auf das Rohr axial aufgeschobenen, radiale Presskräfte ausübenden Presshülse (22) sowie einer Quetschhülse (18) mit einer in das Rohrende eingesetzten Stützhülse (12) verbunden ist, wobei zur Herstellung der Verpressung das Rohrende (10) auf die Stütz- hülse (12) geschoben, darüber die Quetschhülse angeordnet und die Presshülse (22) axial über die Quetschhülse im Stützhülsenbereich aufgeschoben wird, dadurch gekennzeichnet, dass die Presshülse (22) innenseitig in dem Bereich, der beim Aufschieben der Presshülse als erstes über den Bereich der Stützhülse geschoben wird, wenigstens einen radial umlaufenden Presswulst bzw. wenigstens einen Bereich mit verjüngtem Querschnitt (24; 26) aufweist, der derart ausgebildet ist, dass durch diesen höhere Presskräfte aufgebracht werden als von wenigstens einem axial in Aufschiebrichtung hinter dem Presswulst bzw. dem Bereich mit verjüngtem Querschnitt liegenden axialen Innenabschnitt (32) der Presshülse (22).1. Pipe press coupling, in which, in the pressed state, at least one end region (10) of a pipe is connected to a support sleeve (12) inserted into the pipe end by means of a press sleeve (22) axially pushed onto the pipe and exerting radial press forces (22) and a crimp sleeve (18) whereby the pipe end (10) is pushed onto the support sleeve (12) to produce the compression, the crimp sleeve is arranged above it and the compression sleeve (22) is pushed axially over the crimp sleeve in the support sleeve area, characterized in that the compression sleeve (22) on the inside in the area that is pushed first over the area of the support sleeve when the press sleeve is pushed on, has at least one radially circumferential press bead or at least one area with a tapered cross-section (24; 26), which is designed in such a way that higher press forces result from it be applied as at least one axially in the slide-on direction behind the press bead or w. the area with a tapered cross-section, the axial inner section (32) of the compression sleeve (22).
Rohrpresskupplung nach Anspruch 2, dadurch gekennzeichnet, dass die Quetschhülse (18) profiliert ausgebildet ist.Pipe press coupling according to claim 2, characterized in that the crimp sleeve (18) is profiled.
Rohrpresskupplung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der wenigstens eine Presswulst bzw. der Bereich mit verjüngtem Querschnitt (24; 26) eine im Wesentlichen runde Querschittsgestalt aufweist.Pipe press coupling according to claim 1 or 2, characterized in that the at least one press bead or the region with a tapered cross-section (24; 26) has an essentially round cross-sectional shape.
4. Rohrpresskupplung nach einem der Ansprüche 1 bis 3, da- durch gekennzeichnet, dass die Presshülse (22) eine im4. Pipe press coupling according to one of claims 1 to 3, characterized in that the press sleeve (22) in a
Wesentlichen hohlzylinderförmige oder leicht konische Grundform aufweist, wobei unmittelbar an der Stirnseite, die über den Stützhülsenbereich geschoben wird, ein erster abgerundeter Presswulst (24) mit einem ersten Minimaldurchmesser und axial in Aufschiebrichtung dahinter liegend ein zweiter abgerundeter Presswulst (26) mit einem zweiten Minimaldurchmesser vorgesehen ist, der kleiner als der erste Minimaldurchmesser ist.Has an essentially hollow cylindrical or slightly conical basic shape, with a first rounded press bead (24) with a first minimum diameter and axially behind it in the push-on direction, a second rounded press bead (26) with a second minimum diameter provided directly on the end face that is pushed over the support sleeve area is smaller than the first minimum diameter.
5. Rohrpresskupplung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Presshülse (22) in ihrem dem Rohrende (10) zugewandten Stirnendbereich einen Bereich (28) mit einer im Wesentlichen konischen Quer- Schnittsverjüngung aufweist.5. Pipe press coupling according to one of claims 1 to 4, characterized in that the press sleeve (22) in its end region facing the pipe end (10) has a region (28) with a substantially conical cross-sectional taper.
6. Rohrpresskupplung nach Anspruch 5, dadurch gekennzeichnet, dass die Quetschhülse (18) eine außenseitige Pro- filierung (20a,; 20b) aufweist, die mit einer entsprechenden Profilierung der Stützhülse (12) korrespondiert.6. Pipe press coupling according to claim 5, characterized in that the crimp sleeve (18) has an external profiling (20a ,; 20b) which corresponds to a corresponding profiling of the support sleeve (12).
7. Rohrpresskupplung nach Anspruch 6, dadurch gekennzeichnet, dass die außenseitige Profilierung (20a; 20b) der Quetschhülse abgerundet ausgebildet ist. 7. Pipe press coupling according to claim 6, characterized in that the outer profile (20a; 20b) of the crimp sleeve is rounded.
8. Presshülse, dadurch gekennzeichnet, dass diese zur Verwendung in einer Rohrpresskupplung gemäß einem der Ansprüche 1 bis 7 ausgebildet ist.8. compression sleeve, characterized in that it is designed for use in a pipe press coupling according to one of claims 1 to 7.
9. Verfahren zur Herstellung einer Verpressung eines Rohrendes (10) mit einem eine Stützhülse (12) aufweisenden Fitting (14), bei dem das Rohrende (10) über die Stützhülse (12) gesteckt, eine Quetschhülse (18) über das Rohrende im Bereich der Stützhülse geschoben, sowie eine radiale Presskräfte ausübende Presshülse (22) axial über das Rohrende im Stützhülsenbereich aufgeschoben wird, dadurch gekennzeichnet, dass die radialen Presskräfte durch die Presshülse (22) verstärkt von einem Innenbereich (24; 26) der Presshülse aufgebracht werden, der nahe dem dem Fitting (14) zugewandten Stirnende der Presshülse (22) liegt.9. A method for producing a compression of a pipe end (10) with a fitting (14) having a fitting (14) in which the pipe end (10) is pushed over the support sleeve (12), a crimp sleeve (18) over the pipe end in the area of the support sleeve, and a press sleeve (22) exerting radial press forces is pushed axially over the pipe end in the support sleeve area, characterized in that the radial press forces are applied by the press sleeve (22) increasingly from an inner area (24; 26) of the press sleeve which is close to the end of the press sleeve (22) facing the fitting (14).
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die Presskräfte zusätzlich von einem Innenbereich (28) der Presshülse (22) aufgebracht werden, der nahe dem dem Rohr zugewandten Stirnende der Presshülse (22) liegt. 10. The method according to claim 9, characterized in that the pressing forces are additionally applied from an inner region (28) of the pressing sleeve (22) which is close to the end of the pressing sleeve (22) facing the tube.
EP02754289A 2001-07-07 2002-07-01 Press sleeve for pipe press coupling, pipe press coupling and a pressing method Expired - Lifetime EP1405000B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10133183 2001-07-07
DE10133183A DE10133183C1 (en) 2001-07-07 2001-07-07 Compression pipe coupling, for hydraulic lines or underground water or gas lines, has compression sleeve slid axially over crimp sleeve provided with internal compression bead
PCT/DE2002/002372 WO2003004917A1 (en) 2001-07-07 2002-07-01 Pipe press coupling comprising a press sleeve, and a pressing method

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EP1405000A1 true EP1405000A1 (en) 2004-04-07
EP1405000B1 EP1405000B1 (en) 2008-03-26

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CN (1) CN1551962A (en)
AT (1) ATE390594T1 (en)
DE (4) DE10133183C1 (en)
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WO (1) WO2003004917A1 (en)

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DE10133183C1 (en) 2002-11-14
CN1551962A (en) 2004-12-01
DE20280179U1 (en) 2004-03-04
EP1405000B1 (en) 2008-03-26
ATE390594T1 (en) 2008-04-15
DE50211971D1 (en) 2008-05-08
WO2003004917A1 (en) 2003-01-16
DK1405000T3 (en) 2008-07-21
DE10297623D2 (en) 2005-01-05

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